Sealing gasket



Aug.6, 1940. l l.. cmu@ 2210,833

SEALING GASKET Filed oct. 28,V 1937 INVENTOR K y. Lee Efclqugh Patented Aug. 6, 1940 siazmlnqe. GASKET ALee E. Clough, Akron, Ohio, assignor to The General Tire & Rubber Company, Akron, Ohio,

a corporation of Ohio Application October 28, 1937, v4Serlallilo.171,455l

This invention relates to sealing gaskets and more particularly to molded' gaskets/having self-contained means 'for holding the gaskets in position. 4 n

i An object of the invention is to provide an improved, resilient gasket that maintains` a positive Vseal when subjected to mechanical shock and limited relative displacement.

Another object is to provide such a gasket for use in connecting vitrified pipe and the like and which is resistant toacids and other corrosive materials used in the chemical industries. f Another object is to provide a sealing` gasket that is simple in design and constructionv and inexpensive vto manufacture and one whichy is adapted to effect a seal between uneven and irregular surfaces.

Other objects and advantages will become apparent from thetfollowing detailed description of a suitable embodiment of the inventionv which is made in connectionwith the accompanying drawing, in which Figure lis an expanded view partly in section and with parts broken away showing agasket embodying the invention and the mating ends of pipe sections to be joined; l' f i Fig.Y` 2 is a vfragmentary longitudinal sectional view showing the construction of the sealing 'gasket illustrated in Fig. 1 and enlarged with respeci: thereto; Y

core ofthe gasket;

Fig. 4 is a fragmentarydetail assembly view, in section, showing the sealing gasket in place between the pipe sections; and

Fig. 5 is a view similar to Fig. 4 showing a modication of the invention in which thev gasket is made in separable annular sections and the opposed pipe surfaces are formed with coming the bell and spigot joint between successive' length of pipe. The gasket comprises a. cushioning and fluid sealing body portion l of deformable resilient material such as rubber or the like. In the event that rubber is employed it is Fig; 3 is a perspective vview of the'deformable (Chess-z) preferred that it be charged with a quantity of paraillne. during compounding to render. it resistant to corrosive' material.y Variousv quantitieslrof parailine 'can besuccessfully used, but I have foundA under 15%, preferably about 5%, to 5 'give satisfactory results.

Associated with the body portion of the gasket isa deformable core member 2 that is'capable 'of substantially retaining a permanent set. Preferably the core isy formed of a material such 10 as lead which has a minimum of elasticity and is relatively easyto deformv in establishinga seal with the gasket. i

Thej'core member is in the form of a substantially lcylindrical sleeve which is preferably substantially embeddedv within the resilient Vvbody Ijand substantially coextensive therewith'. A vseries of-,circumferentially extending grooves may be formed on the-core member to provide r.suitable bending areas that yield upon. the yappllcation of longitudinal ,orv endwisel compressive forces'to the gasket. l

. A number of apertures or openings' maybe 'formed in the core member so that the resilient body portionv i maybe interlocked withthe core. Thus, the body lis integrall and continuous. on both sides ofjthe core and extends through vthe openings '5 to secure the several parts "of the gasket together. V'These openings reduce the resistance of the'y core to endwise or longitudinal stresses; If desired,` enough openings 3 may be employed so that the'core is suiliciently weakened thereby to dispense with the useof rcircumferential grooves 3.V y j j In assembling the pipe sections the annular 3 gasket is placed on spigot end 'I of pipe section 8. If desired. the inside diameter of the gasket may be slightly less than the spigot so that it has frictional engagement with the spigot section suiiicient to prevent the gasket from sliding of its own weight relative to the pipe if the pipe isV vertical, but insufficient to effect afluidtight seal therewith.

The spigot end 1 of the pipe section 8 with the gasket thereon is inserted into bell 9 of pipe section I0 so that the gasket abuts against an 'annular shoulder I2 at the base of the bell lSi and is confined in an annular space between the spigot 1 and bell 9.

The assembly of the pipe Joint is facilitated if ,50 the rubber gasket is first wetted, since the water serves as a lubricant for the rubber and permits sliding between the gasket and the material of the pipe sections. Endwise or longitudinal pressure applied along exposed edge M of 'Y otherwise be required.

ments.

The resilience and elasticity of the inner and outer layers or portions of the gasket body when f interposed between the core member 2 andthe spigot and bell act as cushions for the absorption of limited mechanical shock and are effective to maintain the seal upon slight displacement of the parts.

Figure 5 illustrates a modification of the invention in which the gasket is made up in separable annular sections I6, I1 and I8. Each section comprises a resilient cushioning body portion I9 similar to the body portion and previously described in connection with the preceding iigures, and a deformable annular core 20. 'I'he cores 20 are imbedded inthe body portions I9 as previouslyA described, and are each provided with a central circumferentially ex tending groove 2| to aordan annular bending zone. Also, spaced openings 22 may be-formed in the cores I9 to permit the rubber of the body portion to extend therethrough, thus integrally joining the portions of the rubber body on both sides of the core. In assembling a pipe joint with` thegasket illustrated in Fig'. 5 the central sections of the gasket are rst placed on the spigot end as indicated in outlineby the brokenline figures. The spigot end 1 of the pipe section 8 is then introduced into the bell 9 of the pipe section Il) and the gaskets forced into place, one at a time. In this manner each section of the gasket is individually positioned and the def formation of each core 20 occurs independently of the others. Accordingly, the degree of deformation of each portion of the gasket core may be controlled independently of the other portions so -that an improved pipe Joint of maximum sealing efliciency is produced. Desirably, the opposed annular i'aces of the bell and spigot which denne the gasket-receiving chamber are formed with annular grooves 24 and 25 respectively. Preferably the grooves are formed so that when the pipe sections are assembled the internal grooves 25 of the bell are in staggered relation with respect to the external grooves 25 of the spigot, so that the annular gasket-receiving chamber between the two pipe ends is substantially uniform in thickness from end to end of the bell.

The present invention is thus seen to provide a gasket having a resilient and elastic body portion which encloses means adapted to substantially permanently retain a set given thereto and maintain the resilient body portion in sealing engagement with the sourrounding walls of the joint to be sealed. p 'I'he gasket is eifective to maintain the fluid seal even when the joint is subjected to mechanical shock and slightl relative movement of the joint parts. Slight flowing or movement of the elastic body portion I of the gasket is permissible since the effect of the core member 2 is to press the elastic material of the body into huid-sealing engagement with the walls of the joint. y

Other modes of applying and utilizing the principles of the invention, including alterations in both the parts and method of assembly may be employed, change being made as regards the detailsdescribed, it being understood that ,the particular form shown .and the procedure set forth are presented for purposes of. explanation and illustration.

What vI claim is:

i. A gasket comprising a cushioning body portion, a core embraced by the body portion and adapted to substantially retain a permanent set and arranged, upon deformation, to distort the body portion, said corek being.substantially coextensive with the body portion and grooves on the core to provide localized bending zones.

2. A gasketl comprising a thin annularsoft metal core, a cushioning body enveloping the core, portions of the body material extending through openings in the core to interlock the core and body, the core adapted to substantially retain deformation for keeping ailuid-sealing distortion imparted to the gasket, and annular areas of the core weakenedto provide bending zones for facilitating deformationot the gasket.

` LEE E. CLOUGH. 

